C72.2 (Malignant neoplasm of olfactory nerve) compared with D43.3 (Neoplasm of uncertain behavior of cranial nerves), from the official CMS tabular data. C72.2 and D43.3 name the same anatomical site (olfactory nerve or bulb) with a different neoplasm behavior. MedCoder-derived
Same anatomical site, different neoplasm behavior.
Same site — uncertain behavior (olfactory nerve or bulb)
The behavior documented for the site — malignant primary, secondary, carcinoma in situ, benign, uncertain or unspecified — decides which column of the neoplasm table, and therefore which code, applies.
Source: CMS Table of Neoplasms
Same site, different neoplasm behavior. C72.2 and D43.3 name the same anatomical site (olfactory nerve or bulb) with a different neoplasm behavior.
From the CMS/CDC Table of Neoplasms: the behavior documented for that site — malignant primary, secondary, carcinoma in situ, benign, uncertain or unspecified — decides which column, and therefore which code, applies.
| C72.2Malignant neoplasm of olfactory nerve | D43.3Neoplasm of uncertain behavior of cranial nerves | |
|---|---|---|
| Billing status | Non-billable header | Billable |
| Classification | C00-D49 — Neoplasms | C00-D49 — Neoplasms |
| Definition | Malignant neoplasm of olfactory nerve is a non-billable ICD-10-CM category code (C72.2). | Neoplasm of uncertain behavior of cranial nerves is a billable ICD-10-CM diagnosis code (D43.3). |
| Includes | Malignant neoplasm of olfactory bulb | — |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources